Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Jungle Shen is strong. This mastery and build set up makes him very durable while still delivering powerful attacks. I have personally penta'd with this build and carried 4v5 games. But he cannot be solo tank for your team, make sure to have a tank support or top(at the very least a couple other juggernauts on your team). GLHF, tear it up out there summoners.